You can usually find these types of documents in the Ayuntamiento of the city or Notarias
for more modern cases possibly post 1865 with the reforms. For older cases the Archdiocesis
examples like Archdiocesis of Guadalajara under Tierra y Aguas.
I recently found out my mother's ancestor Pedro de Oviedo owned Hacienda La Labor (32.000 hectareas)
near Calvillo, Ags. From 1838 to the 1890s when they sold it. He had bought it for 20,000 pesos, at the same
time he bought from the Lopez Pimentel the Casa del Vinculo, which is used today as the government building
of Aguascalientes. The family sold it to the government sometime after 1850.
Stuff is out there you just need to hunt it down. I recently realized genealogy is not diffucult it just takes
time to build its momentum and patience.
Daniel Méndez Camino

Land deeds, and Birth records...